Middle name for Rafferty - solstice

My sister just had a baby boy. His first name is Rafferty, we are searching for a middle name. Hopefully related to the winter solstice as we are in Australia and he was born on the solstice. Something winter solstice related, thoughts?

Something nature related like Ash, Oak or Frost might work, or perhaps Sol, Solomon or Solstice itself. If a little more traditional, perhaps Adam or Lucian with their links to 'earth' and 'light' respectively?